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Simplifying 3x + 80 = x + 120 Reorder the terms: 80 + 3x = x + 120 Reorder the terms: 80 + 3x = 120 + x Solving 80 + 3x = 120 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 80 + 3x + -1x = 120 + x + -1x Combine like terms: 3x + -1x = 2x 80 + 2x = 120 + x + -1x Combine like terms: x + -1x = 0 80 + 2x = 120 + 0 80 + 2x = 120 Add '-80' to each side of the equation. 80 + -80 + 2x = 120 + -80 Combine like terms: 80 + -80 = 0 0 + 2x = 120 + -80 2x = 120 + -80 Combine like terms: 120 + -80 = 40 2x = 40 Divide each side by '2'. x = 20 Simplifying x = 20
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